Illinois 6th District

Terrence Antonio James / Chicago Tribune

Sean Casten, left, Democratic candidate for U.S. representative in the 6th Congressional District, and incumbent Republican Peter Roskam prepare for an election forum moderated by Carol Marin in the studios of WTTW in Chicago on Oct. 22, 2018.

Sean Casten, left, Democratic candidate for U.S. representative in the 6th Congressional District, and incumbent Republican Peter Roskam prepare for an election forum moderated by Carol Marin in the studios of WTTW in Chicago on Oct. 22, 2018.